Telephone-casing.



W. W. DEAN.

TELEPHONE CASING.

APPLICATION FILED JUNE 8, 1910.

Patented Nov. 7, 1911.

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UNI

ABS PATENT OFFICE.

WILLIAM W. DEAN, OF ELYRIA, OHIO, ASSIGNOR TO THE DEAN ELECTRIC COMPANY,OF ELYRIA, 01-110, A CORPORATION OF OHIO.

TELEPHONE-CASING.

Specification of Letters Patent.

Application filed June 8, 1910. Serial No. 565,694.

T 0 all whom it may concern;

Be it known that I, WILLIAM W. DEAN, a citizen of the United States,residing at Elyria, in the county of Lorain and State of Ohio, haveinvented certain new and useful Improvements in Telephone-Casings; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to telephone shells and contemplates moreparticularly the use of metallic shells with interior insulation. In areceiver shell I use an ear cap which is adapted to be fastened to themain portion of the shell. Within the cap end of the inclosure, I mountan insulating member. This member or diaphragm cooperates with the capto form a chamber and if allowed to shift will separate from the capsufficient'to allow sound waves to pass into the chamber where they areextinguished. I connect the diaphragm to the shell in such a way as toprevent this.

My invention will be best understood by reference to the followingdescription when taken in connection with the accompanying illustrationshowing specific embodiments thereof, while its scope will be moreparticularly pointed out in the appended claims.

Figure 1 is a cross section through a receiver shell showing myinvention. Fig. 2 shows a modification.

1 is the main portion or body of the shell being substantially tubularin shape and closed at one end. This closed end is formed into anannular ring 6 and perforated at 7 to admit the conductors to theinterior of the shell. The other end of the shell is expanded and open.A cap 2, is fastened to the shell closing the open end. This cap isfolded inward to form an inverted cone and is perforated at the centerto permit the passage of the sound waves to the ear when the shell is inuse. Within the shell I show insulation 3 here shown in the form of adiaphragm. This diaphragm is perforated at the center to allow soundwaves to pass from the receiver diaphragm to the ear. A chamber isformed between the diaphragm and the cap, into which part of the soundWaves will be diverted and their energy uselessly expended againstthewalls thereof, if the joints between the diaphragm and the cap areopen. The edge of the opening in the cap is folded, as shown at 4:, overthe edge of the opening in the diaphragm, clamping the two together by arivet like joint. In Fig. 2 I show the main portion 11, cap 12, thediaphragm 13, and a hollow rivet 14 turned over at its edge 15 and 16clamping the diaphragm and cap together. These joints make asubstantially sound tight connection operating to exclude sound wavesand to prevent the loosening and shifting of the insulation.

While I have shown these particular embodiments, it will be obvious tothose skilled in the art, that numerous and extensive departures fromthe details of the apparatus here shown may be made without departingfrom the spirit of this invention, the same being herein shown solelyfor the purpose of clearly illustrating the said invention. For exampleI may employ a disk of any kind to close the hollow space in the ear capand may otherwise insulate the mechanism from the shell or may employ myinvention where a hollow cap of insulating material is used inconnection with a diaphragm.

I claim:

1. In a telephone casing constructed of sheet metal, the combination ofa main or body portion, a perforated ear cap adapted to be attached tosaid main portion, an insulating member to protect the metallic surfaceof the cap from any electrical apparatus mounted in the main portion andmeans connecting the insulating member and the cap together at theperipheries of the perforation in the cap.

2. In a telephone casing vconstructed of sheet metal, the combination ofa main or body portion, a perforated ear cap adapted to be attached tosaid-main portion, a perforated insulating diaphragm to protect themetallic surface of the cap from any electrical apparatus mounted in themain portion and a hollow rivet connecting the diaphragm and captogether at the peripheries of the perforations.

3. In a telephone casing the combination of a main portion and aperforated cap, a perforated diaphragm mounted in said casing and meansconnecting the diaphragm and cap together at the peripheries of theperforations.

4. In a telephone casing the combination of a main portion, a perforatedcap therefor and a perforated diaphragm mounted in said casing, saiddiaphragm and cap being riveted together.

5. In a telephone casing the combination of a main portion, a perforatedcap therefor, a diaphragm mounted in said casing and a hollow rivetfastening said cap and diaphragm together.

(3. In a telephone receiver shell constructed of sheet metal, thecombination of a main or body portion, an ear cap perforated to permitthe passage of sound waves therethrough, means to attach said cap tosaid main portion, a perforatedinsulating diaphragm mounted in said capforming a chamber between the cap and the walls of the diaphragm andmeans to prevent sound waves from passing into said chamber.

7. In a telephone casing the combination of a main portion, a perforatedear cap therefor, a perforated insulating member, a hollow rivetconnecting the edges of the peripheries, said cap and an insulatingmember forming a chamber between them.

8. In a telephone receiver shell constructed of sheet metal, thecombination of a ho]- low main portion, an ear cap perforated to permitthe passage of sound waves, means to connect said cap to said mainportion, an insulating diaphragm mounted in said cap and means toprevent the sound waves from passing into the space between said cap anddiaphragm.

9. In a telephone casing, the combination of a main portion, a captherefor, insulating means mounted in said casing and connecting meansuniting said cap and insulating means, said connecting means operatingto exclude sound waves from the space between the cap and insulatingmeans.

10. In a telephone casing, the combination of a main portion, a captherefor, insulating means mounted in said casing, said casing andinsulating means so associated as to form a hollow space between themand means to exclude the sound waves from said hollow space.

In testimony whereof I aflix my signature in the presence of twowitnesses.

\VILLIAM IV! DEAN.

itnesses MARY MALLEY, F. 0. Brown.

Copies of this patent may be obtained for five cents each, by.addressing the Commissioner of Patents. Washington, D. G.

